When looking to obtain a recirculating system for gold recovery you should get the most adjustable system. By getting a system with more than three adjustments for the hopper you can run concentrates and fine gold in a flat setup or bank material in fully adjusted up position. The one piece of equipment should work for whatever type of gold recovery you want. All except one of the recirculators have a three hole adjustment. This doesn't allow for running material with fine gold. Look at all of the systems offered and pick the one that will grow with your needs and is flexible enough to grow with your experience. You may need the equipment to be versatile in the future as you travel and get more experience.